The Steel Helm of Hammerhand (+9,+9) [6,+20]
+3 strength, dexterity, constitution. Provides resistance to acid, cold, dark, nexus. Cannot be harmed by acid, electricity, fire, cold. Sustains strength, dexterity, constitution. Aggravates creatures nearby.
Min Level 20, Max Level 100, Generation chance 12, 6.0 lbs

(Angband 3.1.2v2)